Messages - kirillica

computer is not just a motherboard, memory and disk. infrastructure is something you should also consider. i've seen people switching from pc to mac and vice versa. reasons are different: mac/pc is slow, mac/pc is crashing all the time, mac/pc doesn't have software needed and etc, etc.

so... will you have everything needed from infrastructure point for switching? for example, do you know that Adobe products are much more stable for pc than for mac? have you considering buying outstanding dell ultrasharp monitor? there are lot more questions to consider, as you see.

honestly, the mtf doesn't impress me at all. on the other hand, based on what i've seen from sigma with their latest releases, it should be much better than any equivalents canon or nikon has to offer. my guess the price will be around 750-850$ and i really hope it will perform better than what the MTF shows, otherwise, whats the point? if it does i sure see myself getting myself a copy

one thing i dont understand though, is the A rating... a C would make much more sense

The Sigma MTF *is* better than the Canon MTF for the same zoom and the Sigma lens has less distortion. Vignetting - have to wait and see. Will be interesting to read the DxO review of it, that's for sure!

I would skip DxO review as meaningless. Even for lenses they are sucked (for example, make a comparison between Canon's 200-400 with built-in extender and Nikkor 200-400 without: everything is better for Canon, but transmission is a only a bit behind - Nikkor still has a better overall score )